Multiple-groove-dressing device for abrasive wheels



Nova 29, 1927. I 1,651,225

w. OWEN MULTIPLE GROOVE DRESSING DEVICE FOR ABRASIVE WHEELS Filed March 18. 1926 2 Sheets-Sheet l Nov. 29, 1927. 2' 1,651,225

W. OWE N MULTIPLE GROOVE DRESSING DEVICE FOR ABRASIVE WHEELS Filed March 18, 1926 2 Sheets-Sheet 2 I H 1 l 16 flu-n Patented Nov. 29, 1927.

UNITED STATES I I 1,651,225 PATENT" OFFICE.

WILLIAM OWEN, OF TITTSBURGH, PENNSYLVANIA, ASSIGNOR TO PITTSBURGH PLATE GLASS COMPANY, A CORPORATION OF IENNSYLVANIA.

MULTIPLE-GEOOVE-DRESSING DEVICE FOR ABRASIVE WHEELS.

Application filed March 18, 1926. Serial No. 95,691.

The invention relates to a device for dressing the multiple grooves in abrasive wheels. such as are employed for rounding the edges of glass sheets for use in automobile construction. Such machines comprise a series of grooved abrasive wheels with means for carrying a plurality of sheets of glass, cor-' responding to the number of grooves in the wheels, over such wheels, so that the edges of the sheets are ground to a curvature which is complementary to that of the grooves. In the course of time, the grooves in the wheels are worn so that they lose their proper degree of curvature, and it becomes necessary to dress ,or resurface them back to their original shape. This is done by means of a tool, including a rod of abrasive of cir cular cross section having its working end rounded to the proper curvature. Each groove is in turn subjected to the action of the tool until the surface of the wheel is restored to substantially its original contour. This operation is relatively slow and tedious, requiring considerable skill, and in volving a high labor cost, as the resurfacing is required after only a short period of use of the wheels, otherwise, the quality of the product is impaired, and many of the glass sheets'must be sent through the machine a second time. The object of the present invention is the provision of a dressing attachment, which can very readily-be applied and I removed from existing machines, and which willpermit the accurate resurfacing of the grooves of the wheel simultaneously, and with minimum expenditure of time and effort on the part ofthe operator. bodiment of the invention is illustrated in the accompanying drawings, wherein:

Figure 1 is a vertical section on the line II of Fig. 2. Fig. 2 is a section on the line IIII of Fig. 1. Fig. 3 is a plan view. And Fig. 4 is a detail section.

Referring to the drawings, 1is an annular grinding wheel supported in a spider or frame 2 carried upon a shaft 3, such wheel being provided with a plurality of circumferential grooves 4c, '4, 4, etc. Extending longitudinally of the line of movement of the glass sheets to be ground at the sides of the grinding wheel is a guideway made up of the plates 5 and 6. such plates being provided with the'flanges 7, 8 and 9 (Fig. 2). This guideway serves to carry the drag chain and cooperating devices for engag One em- I ing the series of plates to be ground and carrying them longitudinally over the series of grinding wheels, the construction being one in extensive use and well known to those skilled in the art. The guide plate 5 also carries a longitudinally extending wood ing the lower side of the plate 5. The bolts 16, 16 extend through the vertical flange of the member Y12 and engage the upstanding flange 9 on the plate 6. Means are thus provided for clamping the supporting frame of the dressing device rigidly in position above the grinding wheel, the means shown for accomplishing this purpose permitting of the ready attachment of the device and its detachment after the device has performed its function.

strip 10 suitably secured in position. This Pivotally supported upon a transverse bolt 14 carried by the frame members .11 and 12 p is an arm 18, such arm being provided with a plurality of abrasive dressing sticks or rods 19, 19, 19, etc. Thearm is adjusted up and down by means of the bolt 20 and the nut 21, the bolt having its head 22 (Fig. 1) loosely mounted in the end of the plate 13.

'A spring lock member 23 secured to the plate 13 by means of the screw 2 f engages a slot in the head 22and prevents its rota tion. A spring 25 presses the arm 13 yieldingly upward. The rotation of the nut 21 serves to adjust the arm 18 up and down. and to bring the lower rounded ends of the abrasive sticks 19 into operative engagement with the grooves in the wheel 1.

The abrasive sticks 19 arecarried in split chucks 26 mounted in the sleeves 27, conical cooperating surfaces being provided at 28, so that when the chuck is pulled upwards, it is clamped tightly against the stick 19. The chuck is moved vertically by means of a hollow rod 29 which is secured in the block 30 integral with the upper end at the chuck.

A nut 31 provides for the vertical adjustment of the rod 29, such nut being seated upon the upper end of the-sleeve 27. The abrasive stick 19 is adjusted and held in position by means of a screw 32 extending through the rod 31 and provided with a head 33 at its upper end for turning it. This screw is threaded through thescrew 29 and serves to adjust the position of the rod 123 and to fix it against vertical movement. The upper ends of the sleeves 27 have secured thereto by means of the keys 27 the spur pinions 34, 34, 34-, etc., all meshing to gether in a series, as indicated in Fig. 3, so that when one of the sleeves is turned, a similar rotation-of all of the sleeves'is'secured. The upper end of one of these sleeves is provided with the rotating kn ob or'handlc 35, and by rotating this knob, all of the dressing sticks are rotated, so that the wear at the lower ends of the abrading rods is distributed over such ends and their rounded shape is preserved throughout a long period of use.

i In operation the frame carrying the dress .ing device is clamped securely in position over the grinding wheel, as indicated in Figs. 1 and 2, and each of the dressing rods 19 is'adjusted downward so that it contacts with the surface of a groovein the grind: ing wheel. The chucks 26 are then all tightened and the feed knob 21 is rotated by the operator to cause the ends of the rods 19 to engage the surface of the grooves with a slight amount of pressure. At the same time, the knob 25 is rotated by theoperator so as to shift the surfaces at the ends of the rods19 and bring differentportions thereof in contact with the surface of the grooves which arebeing dressed. The downward adjustment by means of the knob 21 and the rotary movement of the knob are con tinued until each of the grooves isproperly dressed, after which the device is removed fromits position upon the guide plates .5 and '6, and the grinding wheel is readyfor service. I

What I claim is:

1. A dressing device, comprising a frame releasably secured to the work guidewayof subscribed my name this to said frame for movement toward and from the wheel, an adjusting device for the arm, a plurality of dressingrods of abrae sive material carried by the arm and adapted to engage the various grooves in the abrading wheel, each of said rods beingmountedfor rotation about itsaxis, and hand operated gear means for rotatingthe rods in unison.

3. A dressing; device, comprising a frame releasably secured to the work guideway of a grooved abrading wheel, an arm pivoted to said frame for'movement toward and from the wheel, an adjusting device for. 'thexarm,

aplurality of dressing rods ofabrasive material carried by the arm and adapted to engage the various grooves in'the abrading wheel each of said rods being mounted for rotation about its axisgear means connect ing all of the rods, and a hand device for actuating said gear means for rotating the rods in unison.

4. A dressing device, comprising a frame 'releasably secured to thework guideway of a grooved abrading wheel, an arm pivoted plurality. of chucks mounted for rotation in the arm, a rod'of abrasivematerial mounted for longitudinal ad ustment in each chuck,

intermeshing gear wheels "carried by the.

chucks so that they may be rotated together,

and .means mounted for rotation with oneof the chucks for rotating it.

In testimony whereof, I have hereunto 1926. p p v WILLIAM OWEN.

12th day of March,

i'o said framezfor movement toward and from the wheel, an ad usting device for the arm, a 

